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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1801713e408ebcb95d8237cece8ace1a555a80a5fcc89a379f10037c9c4385d' 
  AND token = 'Nl7aaS1pUXysqsjP9CQPFML6bMh4PkoFT++Citdf++s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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