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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd01e7704671cc7a346d16242e9fd5c33aa618340c53c6ae155038c66c9689f' 
  AND token = 'zt+ZGg0tdTPKTLuax95AIkRmGZSS3ui+FVVUFbPY4Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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