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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a929e8103c7603947b482e17178dfcf663b45553c9e5f285990365a5e8d619e4' 
  AND token = 'fHb5AkVZ6sWCI44ifBZKA5SKu7lGf/Rc75qiD0VflKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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