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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b427b057004121a55cc9e5d8b0a6d37a8da0dbda6ae46f1e51d75a29d35fb2' 
  AND token = 'GmD2Bj/N98EsvGJBYJ/7KXkKspA0PAHMMX/BH/0Hfn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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