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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b326a58e645879a493cef80b1e01d82c1709e5bba3a4f3ca134879c107417b' 
  AND token = 'GGhdUTNiuPWmYN53d2v5LzE91O7i5xEj6d9mgMI/ydE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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