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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3003eef2a4c7a4aa4e0a2763b262daff152578b37807dbcb2693b47bb0dbebf8' 
  AND token = '2VddTTuLwSEp9dW/HCn5uWD5cg9wYuQzBDVStjau8kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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