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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ca836e19274f9acfde57b513f8aff70a505f8cfab19e4bbc9b70f9aae4a078' 
  AND token = '/4KYrJxsyh6KL9DlzRn6exEp9xDXW1mtwu31DN2FEHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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