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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeae39a401c09f1a42511c6ee5dd2719a33601b79c8b6e16871e80f7f58d6ba9' 
  AND token = '1fNdjlkb0hVxReI3XmodxcG3eoBQCfI1UyEi5wwzaEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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