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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850d0c7d2671eab5e23ecb32946223795fd585018eead5c1dd5e53a46231aa37' 
  AND token = '9Xhuz9NSYxiP4WCNLJ27AqiDVfqxyBYuOGe+fCl/lDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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