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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3b5e92179721aeab8ddda5329e2960e3df4ab868e950565c2d99b40e6f46ad' 
  AND token = 'XQ4SupxOgQOJtXfjugTnBOtttoazAMEuixPcg2scEjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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