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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47fc21e2b87292f4596c3ca4513c71de69f8993bc8beef5c58d6f3a80e7b2f9' 
  AND token = 'C0L2ACm0Bm4izXSJas6cAce5nPaD5HEWc8ziZlN8BbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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