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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0480f07368cae5f38ff82da90df034477ac044260d55150d56e06db31568525b' 
  AND token = 'zhCbRb98p2kNkJoukgbNP8tyG8KFfLkD3hmVThFL6Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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