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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6e4e4fd588443087b3836b25f399734fe16627205303d530e3e264a8ba2eca' 
  AND token = 'witzkW2AHuxkQPQlaehJD4cQQe2p9d1TD36KamvA52A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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