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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd9c841568d604686c8788006cdc10c7fc428928a3cbeedaaca6dadebe903aa' 
  AND token = '7zYsXbBD8NtsX10Do+O60SRz+7PcOXBwlbC1Btx6yHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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