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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10ce12fcf192fcdd8cee8553c1f7ff11dd94d29d81f0090c5948a3ff9096eba' 
  AND token = 'N7fTG4nqouNxUJcKmeAECnF0LPe4qL6vkOsYFSZfgFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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