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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dfa52e155ae942eada9c2d312316194085c5ba3b73f1b8f91c0fa427a457cd' 
  AND token = '8ximfCEBt/Owmd0cFiJQZwksHeenTNkut3kta41rOkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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