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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2c5ca42e476b99e09f60fbc7923a9a59a196028b5d3e33dbe2e6c4b3784798' 
  AND token = '55+2b5+BdVv2oCsqwEj8rMQ72uuTTLbnj86yS1aJXcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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