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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1356ecfcdf094737ab652390314b9126860af2dc65913610ef72bf43065c0964' 
  AND token = '0jGu4dguh0w9K76XXknhllmEOEnm+XnRNa4VhUXNQO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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