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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4881bf3eb56e90eb4defb1eae724ac09a7c0a4bb3e75f00f085eb3ddebe6cffc' 
  AND token = 'uV9js3pVIae0KXfBmc1o2WL3RJdCiVGred0HaJojPa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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