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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9871955b0dcd589d0e21da2ead757d6c91ffbf0fa7226a61acf62905f9263f6' 
  AND token = 'mpSzis3J552dUUBVODmS3IRYMWx7NR+Yp2I94If43D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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