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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3362043ba854f359bb32bbaa79e75b5e3ea01dfb041b235169e9fa5a7bfd6423' 
  AND token = 'wDhJE+oJ/d2QTVnkFwmOHoLce0HM1g4t3MKVJLMe++o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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