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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4944ca31e1df601e69de820e3fd90799417ce55650a2c26c1b44eea0275611' 
  AND token = 'QRe8c9bKSTaXipQylGXb8r4yYhG1gNdEaZSxfaRoEfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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