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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3872fa0e4797de3c0fe70ce17d925f4c7432670e9725071297f6f226229166ed' 
  AND token = 'pRviWrYCGW5zWgVhH47DuF0y6Q0SfS57hBl+I3sa5+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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