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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651cab4ec1d06080d56fe04d4e2d162c0d4c773e4958f515a48775e758f95020' 
  AND token = 'xBDx+kjyKrUg6WRURMP9YHazS7ExctthoOXxAEK8boo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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