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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aca54fa24f282407b029fb17277f401558dcbd19dafeaa26004f00bc951d8de' 
  AND token = '2zgume//rzQG4+ZmctuO4bhM/44yA1Kdx/2cAgtUQyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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