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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03657a79d6ff56b6fdac6f811e78fd1ddfe33f6976071f4ec3b6841aaabbd6fc' 
  AND token = '9r7a+HBI7ackpbsPxGpfqbhhYb1xdX2BvkdARRdUXYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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