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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cf54b6fe92576c28bd1b94456e6d3163019dcaf8e7b21580e88c2a635ac5a6' 
  AND token = '1Ha62EhRRvrSP9zHRhYWfV6RwKc562sM2jejR18vrCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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