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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8f79b9b28437502f8c1a27acaa402f7a7098d9a50d5371e40b3ce97a8adee6' 
  AND token = '8ni0Fw+FbQyqIiU4CAtSfNK/3Xhs1zvja9hkUkiI+iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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