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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2573bbdc24a008347b24b0aa03aac0d042c6b6333bc1d9df3fa3a37048796ff7' 
  AND token = 'dMncwlsbqxgMGiGIIMg2V7yn6AxDVvw7oqkdeqtaTRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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