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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989e8ca5e085c8a5ac1a60910b8a2d56829637cf85c65bbb33e3edd8d4352f3c' 
  AND token = 'm2HCfcCeznQMz1jlSeGkfa5iHVKfTE2QHX9E+E6d41g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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