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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1115d36fc67c77b91e81be21df431268ffeecd0df5140b5172c998128c1ed736' 
  AND token = 'Ma7aDObBG7bXI53wQrMpO7Mlp5dBJ7tIFuHFvP4oNXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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