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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180ee246a9dad5fae64c8d9b1b2730bc87465b0b983f7e464b26b3711dac1e1a' 
  AND token = '9XF08jWfsT83a37+Y2h9Aqq/26IMotHhx+bHenJyQHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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