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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d39cef5dae8e8a8fdda82cd963d6cfe6bd751ef506d68f4ab624cc3de9fa17c' 
  AND token = '33z9K/3yGKqKxYLxRcr6H/BxbLrfw/rKBpawipJ64to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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