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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184c4e3a81ef1c1f9dad161f7f444ebfad3be9d5654ff8e34ce92df3a88892aa' 
  AND token = '14yAN/TI/b4d7h/B2UgNNT+sg+UGN+KEvxTJSncvzKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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