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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751ceccf19b922627c82f1350a9b1fd56871c499e74fb320bbb46e212799e6a2' 
  AND token = 'T+7c2vVjp7J25HnNLw8k9/uNMOw/wk+nnG/gaBi6Nrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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