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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ccf35a67f4f1a74d8898f1781ae1ba6693b4e6b89b9530bd2a181ce4bf0e2e' 
  AND token = 'JPbIaj4ipcWAZzCYafybbc69g5IJOvBRTpQBspukQlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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