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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb83e154d72af30d4bb2ee10aaf032bc4092031c53fae531472fe67ae681602' 
  AND token = 'WEsv2aDMG0ZW0iNJVTeIXtC8ugowqZmS7ys7bPeiNmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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