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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15282cb5d04afe235fbeeb88ccf627e29f9a53cacad1ed994edeb203124bed50' 
  AND token = '1raoPTmisCn0jtEJXacmq34Er5N/XRDc0+0mIP4afP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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