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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6207220d8ee8a2fe066721c15b13c69fadebb54207d3db3fc72ca82ac5b2b6b' 
  AND token = 'ypR4H9EcZRox0vKNrTexX1zjrR0ZY2SslIFz7Fx+RjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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