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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4380a02f10627a121773d2a46d38508f0ae6a85eb88e1035091ff541d35a08fe' 
  AND token = 'CLu+J78Y7YJq/462rzNpsUMfMQh888O035FpRBaK+zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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