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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b3a0fa8d4f27ec055add4766f90d205b6d02cc51a7ae09e1af14a4fab8fb7d' 
  AND token = 'bc7jeZaSXBx7LBdAhE6kjWFg6eni68QBnzySU//LEgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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