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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95924d2de13ab18554d6095f3d4a0b5a588ffa6f84f592b8d0650ad9c7d95137' 
  AND token = 'Lz9OPCiiqKHqKOjNTMt+lrLy/FRzFXWA4bDsTB26C+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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