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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41910543b44d4d877a36e7f35f9dcd7ab6e61304176c3d9820b1774237408e2d' 
  AND token = 'mMpHX26VAIBYc+wdkZki+Cr5Y6erqbpxxafP6w6zNu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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