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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a25381e17dc67798c5c07b8ed8309aec72f9724b303041e5a4a085684ebff13' 
  AND token = 'kW7ns1pcVqp9SxHW18kxn7XbyRPRWYuAqGXMebkBaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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