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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8014386a6d7fb41bab814142c27cc728c4f6bdd03698e3b4bd343e71692e898' 
  AND token = 'Lnd+JCkgiSujcdDM9MfwIU+yieZNeFDA5J/Jeu5v63c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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