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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c6b0acf28e4f49f1a7724edbb1da34875c93744fed00fb8c9bfb1f0dd05e30' 
  AND token = 'KRqc6BJeIlK3VnvXdFsFkUkYziTsEfeWGAGu8b2u9T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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