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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76c03b36fb891ef1e7db9bcb9384fa6482a2786f44346d1e8378c907e484b88' 
  AND token = 'aY6Wrtv33879aZM6VBokdvETRF2ykwsOUalUHlTU+zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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