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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cc6c651cf0f58d50d5225068756143550406b83e3ac44997e2a5ba81700151' 
  AND token = 'jNfvk9Q8neCuYpDTEAuLpNOeHEpi0QBxaOlfR/vbPhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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