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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d76612c46296dd846a45d4bfff314b040dffd38f952daaa071d2f1fdb6728ac' 
  AND token = 'czhoggsK/3FkNTf2A2rsruJ4pGwl2r7R7/M4uQIkwaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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