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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2869fcaa745c6bcd8175e5b031fbb6a45202c9aad7552b94c25b55d1cce8db' 
  AND token = 'nh7U1mhmaS6k4nxdhjhJY/m/45zXeTR8p6UHhmfe53s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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