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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0400c35aaf291f7dceb8cf0f06b3473691f3b06f75c58acce98190a841fe9956' 
  AND token = 'NKN3I33dBs36De/6iwE9XdoHDk2fXMEFtywxaq6vo8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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