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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ef26b18e043aefdc8af9214a8f7061555e05f64cda2300b6cd3964e4c56812' 
  AND token = 'OifU5qQ434PKaB/HslAbJECdW4Jie8AYu1ZFf2aT85I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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