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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79b680ad25b563a135607a35f855738d5e06a3ccd01affbd4a2b5f23b62496f' 
  AND token = 'kGf7tbvXwHaflcFr2IZNB/7cZltveQE6hXN3LgEFd9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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