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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82be29960cb1d336b5dddada0484792ced22590bf417bd41d8f4536d8a2ffd4' 
  AND token = 'Dj3SjyYGocmd6XkrDZX16Az6Vgnj6U58wkEQi798R9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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