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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aec886a8116edeb1b83bb91b4879561d70c88c8f9f5c0eeab4e8a68cc46e39d' 
  AND token = 'surqZJBedxAaXLEPQgnUD/M+pXS6Xltt7dUVGQBagLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}