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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f52a7d1e19c5b42af71f7091ee429a1dc99ef9b11de7194611877e34ddd5290' 
  AND token = '6HfK9WbVdvsuqqPAxmwvAJ4fmnWh9L36BRVNCQN+RKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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