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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9140b737b7822604ecd6fb5a9171dfef0e9dbb6af133b364638127271d59e88c' 
  AND token = 'j4nGdmoYrLvIUhb2vkyIeISof+eeM2ghO8arz/pa334=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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