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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6076b573911405760e642822ef7a08846c9a3c9a90706a1913ab065855f376' 
  AND token = 'KJJpYdY5YTT9niFrNTC7Qq6QavtIoGZCpwRvvvgaaDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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